ES464741A1 - Equipo de linea de abonado para central telefonica. - Google Patents

Equipo de linea de abonado para central telefonica.

Info

Publication number
ES464741A1
ES464741A1 ES464741A ES464741A ES464741A1 ES 464741 A1 ES464741 A1 ES 464741A1 ES 464741 A ES464741 A ES 464741A ES 464741 A ES464741 A ES 464741A ES 464741 A1 ES464741 A1 ES 464741A1
Authority
ES
Spain
Prior art keywords
telephone exchange
subscriber
transformer
line equipment
telephone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
ES464741A
Other languages
English (en)
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jeumont Schneider SA
Original Assignee
Jeumont Schneider SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jeumont Schneider SA filed Critical Jeumont Schneider SA
Publication of ES464741A1 publication Critical patent/ES464741A1/es
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/005—Interface circuits for subscriber lines

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
ES464741A 1976-12-17 1977-12-05 Equipo de linea de abonado para central telefonica. Expired ES464741A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7638031A FR2374795A1 (fr) 1976-12-17 1976-12-17 Equipement de ligne d'abonne pour central telephonique

Publications (1)

Publication Number Publication Date
ES464741A1 true ES464741A1 (es) 1978-09-01

Family

ID=9181173

Family Applications (1)

Application Number Title Priority Date Filing Date
ES464741A Expired ES464741A1 (es) 1976-12-17 1977-12-05 Equipo de linea de abonado para central telefonica.

Country Status (17)

Country Link
US (1) US4119806A (fr)
JP (1) JPS5376605A (fr)
AR (1) AR214764A1 (fr)
AU (1) AU3149977A (fr)
BE (1) BE861868A (fr)
BR (1) BR7708306A (fr)
DD (1) DD133387A5 (fr)
DE (1) DE2754995A1 (fr)
ES (1) ES464741A1 (fr)
FR (1) FR2374795A1 (fr)
GB (1) GB1540553A (fr)
IT (1) IT1090819B (fr)
LU (1) LU78693A1 (fr)
NL (1) NL7713209A (fr)
OA (1) OA05828A (fr)
SE (1) SE7714362L (fr)
ZA (1) ZA777417B (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5537046A (en) * 1978-09-06 1980-03-14 Nec Corp Subscriber's circuit
DE2903660C3 (de) * 1979-01-31 1981-12-10 Siemens AG, 1000 Berlin und 8000 München Belegschaltung an einer "ankommenden" c-Ader in einer Fernmeldeeinrichtung
WO1981000658A1 (fr) * 1979-08-31 1981-03-05 Electro Med Eng Pty Ltd Affaiblisseur non-reciproque de donnees de lignes telephoniques
US4402039A (en) * 1981-09-03 1983-08-30 Bell Telephone Laboratories, Incorporated Telephone line circuit
EP0078355B1 (fr) * 1981-10-28 1985-07-31 International Business Machines Corporation Circuit d'interface comportant des moyens d'adaptation d'impédance
US4458112A (en) * 1981-10-29 1984-07-03 Telefonaktiebolaget L M Ericsson Floating subscriber loop interface circuit
US4489222A (en) * 1982-09-13 1984-12-18 The Board Of Trustees Of The Leland Stanford, Junior University Telephone line interface
US4532381A (en) * 1984-02-13 1985-07-30 Northern Telecom Limited Active impedance line feed circuit
US4805213A (en) * 1987-02-13 1989-02-14 Unison Technologies, Inc. Ring detector
EP0425675B1 (fr) * 1989-01-19 1996-07-10 Fujitsu Limited Circuit de detection de defaut de connexion a la terre pour lignes d'abonnes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4011410A (en) * 1973-11-13 1977-03-08 Thomas Robert M Communication system interface circuits

Also Published As

Publication number Publication date
GB1540553A (en) 1979-02-14
DD133387A5 (de) 1978-12-27
OA05828A (fr) 1981-05-31
IT1090819B (it) 1985-06-26
AU3149977A (en) 1979-06-21
BR7708306A (pt) 1978-09-05
SE7714362L (sv) 1978-06-18
US4119806A (en) 1978-10-10
LU78693A1 (fr) 1978-04-17
ZA777417B (en) 1978-10-25
JPS5376605A (en) 1978-07-07
BE861868A (fr) 1978-03-31
NL7713209A (nl) 1978-06-20
FR2374795A1 (fr) 1978-07-13
AR214764A1 (es) 1979-07-31
DE2754995A1 (de) 1978-06-29

Similar Documents

Publication Publication Date Title
ES464741A1 (es) Equipo de linea de abonado para central telefonica.
ES465791A1 (es) Perfeccionamientos en circuitos de suministro de corriente constante para lineas de abonados de telefono.
ES8708109A1 (es) Un circuito de linea de telecomunicacion
ES465797A1 (es) Perfeccionamientos en circuitos de interfase de lineas tele-fonicas.
ES462859A1 (es) Un circuito de acoplamiento perfeccionado para interconectaruna linea de transmision de una unidad terminal de remota a una unidad central.
ES488564A1 (es) Dispositivo de llamada utilizable especialmente en una ins- talacion telefonica automatica de abonado
ES464223A1 (es) Equipo para linea telefonica.
JPS5346205A (en) Data transmission system
JPS52139302A (en) Automatic circuit switching unit
GB1254258A (en) A circuit arrangement including a relaxation oscillator for alternately providing ringing-tone and supervisory signals to subscriber stations
SE317716B (fr)
EP0160411A3 (en) Line feed circuit for a digital signal loop
ES453913A1 (es) Perfeccionamientos en circuitos de control automatico de ganacia.
GB971802A (en) Signalling system for substation apparatus
ES370990A1 (es) Disposicion de circuito para regular el equivalente de re- ferencia de transmision y recepcion de un equipo de abonado en un sistema telefonico.
DE3264166D1 (en) Parallel operation of telephone equipment on a digital loop
JPS57210738A (en) Callout connecting system for missing person
GB1533769A (en) Circuit arrangement for audible ringing in an executive/secretary telephone system
GB917509A (en) A circuit arrangement for the supply of current to amplifiers in subscribers' stations
GB824236A (en) Improvements in or relating to telephone apparatus
JPS5366549A (en) Communication current feeder
GB661867A (en) Termination for coupling two-wire to four-wire telegraph lines
GB973309A (en) Improvements in or relating to signalling circuit arrangements
JPS55100794A (en) Space-division line concentration system of time-division exchange
ES8500689A1 (es) Un circuito para la transmision analogica de voz y la senalizacion de comunicacion